Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Lecanoromycetes O.E. Erikss. & Winka (1997)
       Subclass Lecanoromycetidae P.M.Kirk, P.F. Cannon, J.C. David & Stalpers (2001), nom. inval. see Subclass Lecanoromycetidae P.M.Kirk, P.F. Cannon, J.C. David & Stalpers ex Miądl., Lutzoni & Lumbsch (2007)
         Order Peltigerales Walt. Watson (1929)
           Suborder Collematineae Miądl. & Lutzoni
             Family Collemataceae Zenker (1827)
               1 Genus Collema Weber ex F.H. Wigg. (1780), nom. sanct., nom. cons.
               2 Genus Homothecium A.Massal. (1853)
               3 Genus Leciophysma Th.Fr. (1865)
               4 Genus Leightoniella Henssen (1965)
               5 Genus Leptogium (Ach.) Gray (1821)
               6 Genus Physma A.Massal. (1854)
               7 Genus Ramalodium Nyl. (1879)
               8 Genus Staurolemma Körb. (1867)